Heating device

ABSTRACT

A heating device includes a heating unit, which is formed of a rack, a motor and a fan blade assembly, and a heating unit, which is formed of a carrier holding a number of quarts glass or ceramic heating tubes that are coated with a first electrode and a second electrode prepared from nanometered electric radiant film. The heating tubes emit far infrared rays and radiate heat when the fan delivery unit is delivering currents of air through the heating unit.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to heating devices and more particularly, to such a heating device, which emits far infrared rays when producing heat and, which has the advantages of high thermal efficiency, low electromagnetic wave, ease of fabrication, and recyclable materials.

2. Description of the Related Art

Many different hair-dryers are commercially available. These hair dryers include conventional hair dryers, negative ion hair dryers, far infrared hair dryers. Taiwan Patent 93221183 discloses a temperature regulation hair dryer, which comprises a hair dryer body, a temperature sensor, a control member, and a display screen. The hair dryer body has installed therein a fan and an electric heating net. The hair dryer body also has an air output port for sending out hot air. The temperature sensor is installed in the air output port of the hair dryer body and electrically connected to the display screen. The control member is installed in the hair dryer body for controlling the heating temperature of the electric heating net. The temperature sensor detects the temperature around the air output port, and then indicates the detected temperature through the display screen. The user operates the control member to adjust the heating temperature of the electric heating net to the desired level.

Further, Taiwan patent 94214346 discloses a negative ion hair dryer, which comprises a housing formed of two symmetrical half shells, an exhaust fan installed in the front side of the housing, a net installed in the rear side of the housing, and other parts including a control circuit device, an electric heating device, a motor, an induced-draft fan, and a negative ion generator mounted inside the housing. The control circuit controls the motor to rotate the induced-draft fan inducing currents of air toward the inside of the housing. At the same time, the electric heating device and the negative ion generator are driven by the control circuit to emit heat and to generate negative ions. Thus, hot air carrying negative ions is sent out of the housing for application.

Further, Taiwan Patent 94217138 discloses a far infrared hair dryer, which comprises a housing, which has a bottom handle and an air output port, a fan and a motor mounted inside the housing near the air output port, and a thermal module mounted inside the housing. The thermal module comprises a porous ceramic heating member supported on spacer rods, an inner conducting ring and an outer conducting ring respectively provided at the front and rear sides of the ceramic heating member, and elastic pads respectively sandwiched between the ceramic heating member and the inner conducting ring or outer conducting ring.

The aforesaid prior art designs do not have a high thermal efficiency because they do not use quarts glass tubes or ceramic tubes for producing heat. Therefore, the aforesaid prior art designs.

SUMMARY OF THE INVENTION

The present invention has been accomplished under the circumstances in view. It is therefore the main object of the present invention to provide a heating device, which emits far infrared rays when producing heat and, which has the advantages of high thermal efficiency, low electromagnetic wave, ease of fabrication, and recyclable materials.

To achieve this and other objects of the present invention, the heating device comprises an electric heating unit and an air delivery unit. The electric heating unit comprises a carrier made out of an electrically insulative material, the carrier having a first support member and a second support member respectively disposed at two distal ends thereof, the first support member and the second support member each have a plurality of retaining portions, a plurality of heating tubes supported between the first support members and the second support members, the heating tubes each having a first electrode and a second electrode disposed at two opposite ends thereof and respectively kept in contact with the retaining portions of the first support member and the second support member, and a voltage reducing line for conducting electricity to the heating tubes for causing the heating tubes to radiate heat, the voltage reducing line comprising a first lead wire and a second lead wire respectively coupled to the first electrodes and second electrodes of the heating tubes. The air delivery unit comprises a rack, the rack having a hollow protruding portion fastened to one end of the carrier, a motor mounted inside the hollow protruding portion, and a fan blade assembly coupled to the motor and suspending inside the rack for causing currents of air through the electric heating unit when the heating tubes are caused to radiate heat.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of a heating device in accordance with the present invention.

FIG. 2 is an elevational assembly view of the heating device in accordance with the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 1, a heating device in accordance with the present invention can be used in a hair dryer, copy machine, scanner, laser printer, or the like. The heating device is comprised of an electric heating unit 10 and an air delivery unit 30.

The electric heating unit 10 is comprised of a carrier 11, a plurality of heating tubes 12, and a voltage reducing line 17. The carrier 11 is made out of an electrically insulative material, for example, plastics, having a conical profile. The two distal ends of the carrier 11 are respectively mounted with a first support member 15 and a second support member 16. The first support member 15 and the second support member 16 each have a plurality of retaining portions 151 or 161. The heating tubes 12 are secured to the first support member 15 and the second support member 16, each having a first electrode 13 disposed at one end in contact with the associating retaining portion 151 of the first support member 15 and a second electrode 14 disposed at the other end in contact with the associating retaining portion 161 of the second support member 16. The heating tubes 12 can be quartz glass tubes or ceramic tubes coated with a layer of heating film, for example, nanometered electric radiant heating film. The number of the heating tubes 12 may be changed subject to actual requirements. According to this embodiment, the number of the heating tubes 12 is 6. Further, the first support member 15, the second support member 16, and the retaining portions 151 and 161 are made out of a metal material and kept in contact with the first electrodes 13 and the second electrodes 14 for electrical conduction.

The voltage reducing line 17 comprises a first lead wire 18 and a second lead wire 19 respectively coupled to the first electrode 13 and the second electrode 14 so that power supply can be coupled to the first electrodes 13 and the second electrodes 14 to cause the heating tubes 12 to generate heat.

The air delivery unit 30 is comprised of a motor 31, a rack 32, and a fan blade assembly 33. The rack 32 has a hollow protruding portion 34. The motor 31 is mounted in the hollow protruding portion 34 of the rack 32 and fastened to the fan blade assembly 33. The carrier 11 has one end tightly sleeved onto the hollow protruding portion 34 of the rack 32.

Further, wing members 35 are provided in the hollow protruding portion 34 and the rack 32. The wing members 35 each have a front V-notch 36 for securing the voltage reducing line 17.

Referring to FIG. 2, the first electrode 13 and the second electrode 14 are coated on the outer surface of each heating tube 12, and then the heating tubes 12 are fastened with the respective two distal ends to the retaining portions 151 of the first support member 15 and the retaining portions 161 of the second support member 16, and then the motor 31 is mounted in the hollow protruding portion 34, and then the fan blade assembly 33 is inserted into the rack 32 and coupled to the motor 31, and then the carrier 11 is tightly sleeved with its one end onto the hollow protruding portion 34, and then the first lead wire 18 and the second lead wire 19 are respectively coupled to the first electrodes 13 and the second electrodes 14 and secured to the front V-notches 36 of the wing members 35, and the installation of the heating device is thus finished.

When electrically connected, electric current goes through the heating tubes 12 via the first electrodes 13 and the second electrodes 14, thereby causing the electric radiant heating films of the heating tubes 12 to radiate heat. At the same time, the motor 31 is started to rotate the fan blade assembly 33, thereby causing currents of air to flow through the inside of the rack 32 and the heating tubes 12 toward the other side of the carrier 11 for application. Because the heating tubes 12 are made out of quartz glass or ceramics and respectively coated with a layer of electric radiant heating film, the heating tubes 12 emit far infrared rays when radiating heat. This design of heating tubes 12 has the advantages of high thermal efficiency, low electromagnetic wave, ease of fabrication, and recyclable materials. When compared to conventional hair dryers, the heating device of the present invention shows an inventive step.

Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. 

1. A heating device comprising: an electric heating unit, said electric heating unit comprising a carrier made out of an electrically insulative material, said carrier having a first support member and a second support member respectively disposed at two distal ends thereof, said first support member and said second support member each have a plurality of retaining portions, a plurality of heating tubes supported between said first support members and said second support members, said heating tubes each having a first electrode and a second electrode disposed at two opposite ends thereof and respectively kept in contact with the retaining portions of said first support member and said second support member, and a voltage reducing line for conducting electricity to said heating tubes for causing said heating tubes to radiate heat, said voltage reducing line comprising a first lead wire and a second lead wire respectively coupled to the first electrodes and second electrodes of said heating tubes; and an air delivery unit, said air delivery unit comprising a rack, said rack having a hollow protruding portion fastened to one end of said carrier, a motor mounted inside said hollow protruding portion, and a fan blade assembly coupled to said motor and suspending inside said rack for causing currents of air through said electric heating unit when said heating tubes are caused to radiate heat.
 2. The heating device as claimed in claim 1, wherein said heating tubes are made out of one of the materials of quartz glass and ceramics, and respectively coated with a layer of electric radiant heating film; the number of said heating tubes is equal to the number of the retaining portions of said first support member and the number of the retaining portions of said second support member.
 3. The heating device as claimed in claim 2, wherein said first support member and said second support member and the retaining portions of said first support member and said second support member are made out of a metal material for conducting electricity through the first electrodes and second electrodes of said heating tubes.
 4. The heating device as claimed in claim 1, wherein the first electrode and second electrode of each of said heating tubes are respectively formed of a nanometered electric radiant film and coated on the surface of the respective heating tube.
 5. The heating device as claimed in claim 4, wherein the first electrode and second electrode of each of said heating tubes emit far infrared rays when electrically connected.
 6. The heating device as claimed in claim 1, which is to be used in one of a hair dryer, a copy machine, a scanner, and a laser printer.
 7. The heating device as claimed in claim 1, wherein said carrier has a conical profile.
 8. The heating device as claimed in claim 1, wherein said rack has a plurality of wing members connected to said protruding portions, said wing members each having a front V-notch for securing said voltage reducing line. 